(b) The force between two electric charges is given by the equation F = A Q1Q2 r where A is a constant , Q1 and Q2 are the charges on each of the

(b) The force between two electric charges is given by the equation
F = A Q1Q2
r²
where A is a constant , Q1 and Q2 are the charges on each of the particles and r is the separation of the charges.

(i)
Rearrange Equation 1 to make A the subject of the equation.
(ii)
Use your answer to (i) to find the units of A. You should express your answer in terms of the SI unit of charge and any other units should be SI base units (using letters and symbols to represent all units). Ensure that you show your working.